Converter device and coil arrangement for a voltage regulator

1. A converter device comprising a converter and a coil arrangement ( 1 , 2 , 3 , 4 , 31 ) that contains a number of coils, wherein the coil arrangement ( 1 , 2 , 3 , 4 , 31 ) has a plurality of interconnected coils, and wherein toroidal cores consisting of a soft magnetic material are associated with each of said coils, a coupling toroidal core ( 11 , 11 ′, 16 , 16 ′) is provided with a core opening ( 12 , 12 ′, 16 , 16 ′) through which at least two windings ( 8 , 9 , 38 1 , 38 2 , 38 n-1 , 38 n ) of different coils can be guided and mounted, at least the winding ( 8 , 9 ) of one coil is guided and mounted through a core opening of an individual toroidal core ( 13 , 14 ), and an open/closed-loop control device is provided with a current controller that acts on the coils such that direct current components are compensated by currents (i 1 , i 2 . . . i n ) flowing through the windings ( 8 , 9 ) of the coils.

2. The converter device according to claim 1 , wherein the coil arrangement ( 1 , 2 , 3 , 4 , 31 ) is connected on the load side or on the line side of a converter ( 28 ) and wherein the converter ( 28 ) is configured as a rectifier or as an inverter.

3. The converter device according to claim 1 , wherein the converter device has a multiphase configuration and an intermediate voltage circuit ( 27 ) to which the coil arrangement ( 31 ) is connected on the load side, and wherein load-side connections of the coils are connected separately to different connections ( 32 , 33 , 34 ) of a subordinate unit ( 29 ) of the converter device.

4. The converter device according to claim 1 , wherein the coil arrangement ( 1 , 2 , 3 , 4 , 31 ) is integrated in a converter device having an intermediate current circuit or in a Z-source converter device.

5. A coil arrangement for voltage regulator circuits ( 5 ), comprising a coil that contains a toroidal core ( 11 ) consisting of a soft magnetic nanocrystalline material and a winding ( 8 , 9 ) which is guided and arranged through a core opening ( 12 ) of the toroidal core ( 11 ), wherein a coupling toroidal core ( 11 ) is provided with a core opening ( 12 ) through which at least two windings ( 8 , 9 ) of different coils can be guided and mounted, at least one winding ( 8 , 9 ) is guided and mounted through a core opening of an individual toroidal core ( 13 , 14 ), and an open/closed-loop control device is provided, by means of which electric currents (i 1 , i 2 ) flowing through the windings ( 8 , 9 ) are acted on such that direct current components of the currents (i 1 , i 2 ) are compensated.

6. The coil arrangement according to claim 5 , wherein a first winding ( 8 ) and a second winding ( 9 ) can be guided and mounted through the core opening ( 12 ) of each associated individual toroidal core ( 13 , 14 ), and the steady component of the first current (i 1 ) flowing through the first winding ( 8 ) is equal in magnitude or has a deviation in magnitude of a maximum of 30% and flows in the opposite direction with respect to the second current (i 2 ) flowing through the second winding ( 9 ).

7. The coil arrangement according to claim 5 , wherein the first winding ( 8 ) and the second winding ( 9 ) are arranged in a joint core opening ( 12 ) of multiple coupling toroidal cores ( 11 ).

8. The coil arrangement according to claim 5 , wherein only the first winding ( 8 ) is arranged in the core opening ( 12 ) of the individual toroidal core ( 13 ).

9. The coil arrangement according to claim 5 , wherein the first winding ( 8 ) as a first coil on a first switching leg ( 6 ), the second winding ( 9 ) as a second coil on a second switching leg ( 7 ) of a voltage regulator circuit and, in each case, another connection of the first winding ( 8 ) and of the second winding ( 9 ) are interconnected.

10. The coil arrangement according to claim 5 , wherein the first winding ( 8 ) and the second winding ( 9 ) are each joined between switches (T 1 , T 2 , T 3 , T 4 ) of the switching legs ( 6 , 7 ).

11. The coil arrangement according to claim 5 , wherein the coupling toroidal core ( 11 ) and the individual toroidal core ( 13 , 14 ) are wound from a soft magnetic strip and have an intrinsically homogeneous permeability distribution.

12. The coil arrangement according to claim 5 , wherein the coupling toroidal strip core ( 11 ) and the individual toroidal strip core ( 13 , 14 ) consist of a nanocrystalline iron-based (e.g. Fe—Cu—Si—B—Nb) alloy.

13. The coil arrangement according to claim 5 , wherein the strip of the coupling toroidal strip core ( 11 ) and of the individual toroidal strip core ( 12 ) is heat-treated, wherein such a tractive force acts in the longitudinal direction that the desired permeability of the strip is adjusted.

14. A coil arrangement comprising a coil that contains a toroidal core consisting of a soft magnetic nanocrystalline material and a winding which is guided and arranged through a core opening of the toroidal core, wherein a coupling toroidal core ( 11 ) is provided with a core opening ( 12 ) through which at least two windings ( 8 , 9 ) are guided, no individual toroidal core is associated with a first winding ( 8 ), an individual toroidal core ( 14 ) is associated with a second winding ( 9 ), and wherein the second winding ( 9 ) can be switched in a currentless or current-carrying manner, so that an inductance (L 1 ) of the first winding ( 8 ) can be modified between a first inductance in which the second winding ( 9 ) is open, and a second inductance in which the second winding ( 9 ) is current-carrying.

15. The coil arrangement according to claim 5 , wherein the nanocrystalline coupling toroidal strip core and/or the individual toroidal strip core ( 11 , 11 ′, 16 , 16 ′) has/have a relative permeability μ r of less than 100.

16. The converter device according to claim 1 , wherein said soft magnetic material is nanocrystalline material.